Washing machine pump



Sept 1954 A. H. DE Moss 2,688,930"

WASHING MACHINE PUMP Filed Jan. 27, 1951 2 Sheets-Sheet l INVENTOR. 44 5:27- A. 0: Moss Sept. 14, 1954 DE Moss 2,688,930

WASHING MACHINE PUMP Filed Jan. 27, 1951 2 Sheets-Sheet 2 I Lis -.3

INVENTOR. AL sear H. 0: Moss A T TORN V Patented Sept. 14, 1954 UNITED STATES PATENT OFFICE WASHING MACHINE PUM Albert H. De Moss, Milwaukee, Wis. Application January 27, 1951, Serial No. 208,166

2 Claims.

This invention relates to eentrifugal pumps designed in such a way as to be especially applicable for pumping water and suds from washing machines and for other similar purposes.

An object of the invention is to provide a simple, economical and efficient pump for washing machines and for such other purposes.

Another object of the invention is to provide a pump for such purposes which can be manufactured by the employment of economical fabrication processes capable of being practiced by the use of inexpensive materials and equipment.

Another object of the invention is to provide a pump that easily may be installed on any kind of .a standard washing machine and which may be installed without the necessity for providing supporting brackets, fixtures or devices that ordinarily are required in the installation of such pumps.

For a better understanding of the invention reference may now be had to the accompanying drawing forming a part ,of this specification in which:

Figure 1 is a longitudinal sectional view of a pump installed on an outlet or drain conduit leading from a washing machine or other similar device and which is illustrated as being connected to the drive shaft of the motor of the washing machine or device, the opposite end of the drive shaft being employed in driving the washing machine or device.

Figure 2 is a cross section through the conduit forming the inlet to the pump illustrated by Fig- .urel. Figure 2 is taken substantially in the plane [of line 2-2 on Figure 1 and illustrates in end :elevation and beyond the plane of line 2-2, the pump referred to as embracing the principles of the invention.

Figure 3 is a viewsimilar to that illustrated by Figure 1 except that Figure 3 illustrates a slight.-

ly different form of pump embracing the princi- 'ples of the invention.

Figure 4 is a cross sectional view of the structure illustrated by Figure 3. Figure '4 is taken substantially in the plane of line 4-.-4 on Fig-- ure 3 looking in the direction of the arrows thereg Referring particularly to Figures 1 and 2 it will 'be apparent that the numeral {0 indicates one end of an electric motor fromwhich projects an axially disposed drive shaft indicated by the nu- The shaft II is adapted to drive a pump indicated generally at 12 which is employed for pumping suds and water from the outlet of the wash-. ing machine or other device. The pump l2 has an end Wall I3 formed in such a Way as to pro-- vide a concentrically disposed inlet connection M for the pump 12. The inlet connection I4 is adapted to be projected within a flexible rubber hose or outlet conduit L6 the opposite end of which is adapted to be secured to the outlet connection of the washing machine or other device with which the pump I0 is employed.

{The pump l2 has a cylindrical casing ll provided with a closed end I 8 from which a bearing member 19 projects axially and outwardly with respect to the casing I1. The bearing member I9 contains a bushing 2| adapted to be press fitted or otherwise secured within the bearing member 19. The bushing 2| is adapted to receive a tubular pump shaft indicated at 22 which has an end projecting within the casing l! and to which end a flexible rubber or other suitable impeller 23 is secured. The impeller 23 is adapted to be rotated by the shaft 22in such manner that water and suds will be jcentrifu ally impelled within the casing I! from the inlet connection l4 to an outlet connection indicated by the numeral 24. The outlet connection 24 projects fromthe periphery of the casing I! in the plane of rota.- tion of the impeller 23 and with one side there? of disposed approximately in tangential relation to the interior cylindrical surface of the casing I1. A flexible rubber drain conduit or hose 25 is adapted to be connected to the outlet 24.

The motor shaft l l is secured within the tubular pump shaft 22 by a tongue or key 26 which is adapted to engage a flat surface 2'! formed on one side of the shaft II. The key or tongue '26 is formed by cutting oppositely disposed and .circumferentially extending slits 28 within an intermediate portion of the tubular shaft 22. The material of the tubular shaft 22 is then pressed inwardly between the slits 28 until the tongue 26 forms a cord or bar extending across the tube 22 between opposite ends of the slits 28. The tongue 26 is formed in such a way that the inner surface thereof engages the flat surface 21' formed on the shaft II to prevent relative rota- .tion between the tubular shaft 22 and the motor shaft H.

The inner end of the shaft 22 is adapted to extend a part of the way across the casing I?! toward the end wall I 3. The inner endof the tubular shaft 22 is provided with diametrically opposed axially e tendin slots indicat d a 21 which are adapted to ai present ng imtat qn I of the impeller 23 with respect to the tubular shaft 22. The impeller 23 has a pair of opposite- 1y disposed blades 3| and 32 and a hub 33, the

latter being formed to project around and within the inner end of the tubular shaft 22. The surface of the hub 33 adjacent the tubular shaft 22 may be provided with an annular groove which is formed in such a way as to receive and to fit the inner end of the tubular shaft 22 and the diametrically opposed notches 29. The impeller 23 may be secured upon the inner end of the tubular shaft 22 by bonding or otherwise securing the rubber or other material of which the impeller is 1 formed, to the engaging interior and exterior surfaces of the inner end of the tubular shaft 22. The hub 33 has an axially disposed portion indicated at 34 which projects within the inner end of the tubular shaft 22 and extends across the notches 29. A thrust or spacing ring 36 is disposed between the adjacent end surface of the hub 33 and the' inner extremity of the bearing member I9. The bushing 2I terminates a short distance away from the adjacent surface of the thrust ring 36 in order to provide an annular space for receiving an annular sealing ring indicated at 31. The sealing ring may be formed of rubber of any kind or other suitable material and is compressed within the annular space referred to for the purpose of preventing leakage of liquid between the exterior surface of the tubular shaft 22 and the interior surface of the bushing 2|. The end of the tubular shaft 22 adjacent the motor I0 is grooved in such a way as to receive a snap ring indicated at 48 which is adapted rotatably to engage a thrust washer 49 disposed between the snap ring 48 and the adjacent end surfaces of the bearing member I9 and the bushing 2 I.

The end wall I3 may be of frusto-conical shape as indicated by Figure 1 for the purpose of closely approaching the tapering ends of blades 3I and 32 of the impeller 23. The outer extremity of the wall I3 is formed in such a way as to provide an outwardly projecting peripheral flange which is indicated at 38 and the exterior surface of which is adapted to telescopically engage the interior surface of the cylindrical wall of the casing I1. The outer extremity of the flange 38 is flared outwardly to provide an annular bead indicated at 39 which is adapted to receive a rubber ring or gasket indicated at 4 I. The gasket M is compressed against the edge of the cylindrical outer wall of the casing I1 by an oppositely disposed pair of spring fasteners 42 which are pivoted on pins 43 between spaced lugs 44 projecting rearwardly from the outer periphery of the closed wall I3 of the casing I1. The fasteners 42 have hook shape ends 46 which are adapted resiliently to contract around the exterior surface of the bead 49 when the fasteners 42 are closed. The fasteners 42 compress the rings 4| for the purpose of sealing the casing I1 to prevent leakage of liquid between the adjacent surfaces of the casing and the end wall I3.

The pump I2 may be installed on a washing machine with which it is to be employed merely by projecting the tubular shaft -22 upon the end of the motor shaft II with the tongue 26 engaging the flat surface 21 of the shaft and by connecting the conduits I6 and 25 to the pump inlet I4 and outlet 24 respectively. The outlet or drain conduit I6 should be made in such a way as to be flexible enough to bend in any desired direction and to expand over the pump inlet I4 but sufficiently rigid so that it will not be distorted by 4 the reaction upon the casing I1 resulting from the rotation of the impeller 23.

The structure illustrated by the Figures 3 and 4 also comprises a cylindrical casing 5| having an end wall 52 and a bearing member 53, which is similar to the casing I1 in the structure disclosed by Figures 1 and 2. The bearing member 53 receives a bushing 54 in which is rotatably secured a tubular shaft 55 adapted to be driven by the motor shaft II through a tongue 56 projecting inwardly therefrom. The tongue 56 is formed in the tubular shaft 55 in the same manner that the tongue 26 is formed in the shaft 22 disclosed by Figures 1 and 2. The opposite end of the bearing member 53 is provided with thrust rings 51 and 58 and 59 which are respectively similar to the rings 31, 48 and 49 illustrated by the structure shown by Figures 1 and 2. An annular rubber sealing ring or other suitable sealing means indicated at 61 also is employed at the inner extremity of the bushing 54 for the purpose of preventing leakage between the inner surface of the bushing and the outer surface of the tubular shaft 55. I

The inner extremity of the tubular shaft 55 supports an impeller 62 and the open end of the casing 5l is closed by an end wall 63 having a pump inlet connection 64 projecting axially therefrom. The impeller 62 is provided with blades 66 and 61 projecting in opposite directions from a centrally disposed hub indicated at 66. The hub 68 is of uniforms diameter from one end to the other thereof and is of such size that the hub may be compressed within the interior surface of the end of the tubular shaft 55 projecting within and across the space within the casing 5|. The tubular shaft 55 is provided with diametrically opposed and axially extending slots indicated at H for receiving the impeller blades 66 and 61 when the hub 69 is compressed within the end of the tubular shaft 55. The hub '68 and blades 66 and 61 may be made sufficiently large so that the compression thereof within the tubular shaft 55 and the slots 11 will provide a seal between the impeller 62 and the tubular shaft 55 thereby preventing leakage of liquid between the two. An additional seal may be provided for the interior surface of the tubular shaft 55. This may be constructed in a form of a curved disc indicated at 12 and the edges of which may be tightly compressed against the interior surface of the tubular shaft 55 by deforming the disc after it is inserted within the tubular shaft 55. The impeller 62 may be secured upon the end of the tubular shaft 55 by a snap ring indicated at 13.

The impeller 62 may be formed by cutting off suitable lengths from an extruded strip of rubber or other suitable material, such lengths being equal to the depth of one of the impellers 62.

The end wall 63 is provided with a suitable flange 14 and a bead 16 adapted to project within and over the casing 5| for compressing an annular rubber gasket indicated at 11. The end wall is held. in position upon the casing 5I by fasteners 19 which are similar to the fasteners 62 illustrated in the structure shown by Figures 1 and 2. The casing 5| may be provided with a tangential outlet such as that indicated in the structure shown by Figures 1 and 2 or it may be provided with a radially disposed outlet such as that indicated by the numeral 19. The radially disposed outlet 19 will function practically as well as the tangentially disposed outlet 24 and the radially disposed outlet 19 has the advantage that a pump with which it is employed may be used with motors driven in either direction. The outlet 19 is adapted to be connected to a hose or other suitable conduit 8| and through which the liquid delivered by the pump may be delivered to an elevated tub or to other liquid draining means. The inlet 64 is adapted to project within the end of drain conduit 82 which is similar to the drain conduit l6 shown by Figures 1 and 2.

The claims:

1. In a centrifugal pump, a tubular shaft having a plurality of axially extending slots projecting into said shaft from one end thereof, and a rotary liquid impeller of resilient material, said impeller having a hub, at least a portion of which snugly interfits within said slotted shaft end to seal said end and to provide readily detachable mounting of said impeller, said impeller having portions entering said slots to key said impeller to said shaft.

2. A readily demountable centrifugal pump comprising a cylindrical casing having a closed end and an open end, a tubular shaft projecting into said casing through a restricted opening in said closed end, said shaft having a plurality of axially extending slots projecting into said shaft from the end thereof within said casing, a rotary liquid impeller of resilient material, said impeller having a hub, at least a portion of which snugly interfits within said slotted shaft end to seal said end and to provide readily detachable mounting of said impeller, said impeller having portions entering said slots to key said impeller to said shaft, an end closure for said open end of said casing, said end closure being formed to provide a peripheral flange adapted telescopically to engage the interior surface of said casing, said flange being formed beyond the adjacent end of said casing to provide an outwardly projecting References Cited in the file of this patent UNITED STATES PATENTS Number Name Date 1,402,719 Bartlett Jan. 3, 1922 1,790,470 Hansen Jan. 27, 1931 1,971,406 Hartzell Aug. 28, 1934 2,116,397 Lapham May 3, 1938 2,120,277 Grierson June 14, 1938 2,141,916 Johnson Dec. 27, 1938 2,152,805 Hoffmann Apr. 4, 1939 2,283,263 Kates May 19, 1942 2,331,641 Walker Oct. 12, 1943 2,371,250 Maroney Mar. 13, 1945 2,402,939 Auslander et al July 2, 1946 2,512,394 Sullivan June 20, 1950 FOREIGN PATENTS Number ,Country Date Great Britain Dec. 22, 1944 

